A service that feeds off-chain data, usually prices, to on-chain contracts.
Last verified 13 September 2026 · written by the DexLadder team
What it means
A service that feeds off-chain data, usually prices, to on-chain contracts.
Why it matters when you trade
Contracts cannot see prices by themselves, so lending markets, perpetuals and liquidations all depend on an oracle being right. That makes the oracle the highest-value attack surface in DeFi: manipulate a thin market that an oracle reads, and you can force liquidations or borrow against inflated collateral. Robust designs aggregate many sources and use time-weighted prices for this reason.
Worked example
A flash-loan-driven spike in a thin pool drives an oracle price up, allowing a loan against collateral that is not worth what the contract believes.
See it on live markets
DexLadder runs oracle against live market and pool data, with simulated capital, so you can watch it act on an order instead of reading about it — no account, no wallet, nothing installed.